PARIS (Reuters) - Roger Federer and Novak
Djokovic were both put to the test to reach the fourth round of the
French Open on Friday while Maria Sharapova continued to blaze through a
thinning women's draw.

Polish third seed Agnieszka Radwanska was knocked out 6-4 6-4 by
Croatian Ajla Tomljanovic, becoming the latest victim of a new
generation of talent sweeping through the women's draw.

But seventh seed Sharapova inflicted the first double bagel of the
tournament to remain the overwhelming favourite.

"I am relieved and happy to be through to the next round," said
fourth seed Federer, who wasted 17 break points.

Tursunov, the 31st seed, played boldly but needed treatment on a
sore groin in the third set and Federer triumphed to set up a
meeting with Latvia's Ernests Gulbis, who is rediscovering his best
form after a freefall in the rankings.

Djokovic, one of three men to have beaten eight-times Roland Garros
champion Rafa Nadal on clay this season, showed signs of frustration
against Cilic.

He seemed in complete control when his 25th-seeded opponent forced a
tiebreak that the six-times grand slam winner lost 7-2. Djokovic
regained control, however, and sealed victory when Cilic
double-faulted.

"Physically I had to work very hard, because he was very aggressive,
and I could expect that," said Djokovic.

"In important moments I held my nerve and, you know, I'm very happy
that I went through."

His next opponent will be local favourite Jo-Wilfried Tsonga, the
13th seed, who defeated Polish 22nd seed Jerzy Janowicz 6-4 6-4 6-3.

There was no joy for the other Frenchman on course as Gilles Simon,
the 29th seed, lost 4-6 6-3 2-6 6-2 7-5 to eighth seed Milos Raonic,
who became the first Canadian man to reach the round of 16 at Roland
Garros.

In the women's draw, the top three seeds have all been sent packing
following the first-round exit of Chinese Li Na and the second-round
elimination of defending champion and world No.1 Serena Williams.

It was the first time since tennis turned professional in 1968 that
the top three seeds in the women's draw have failed to qualify for
the fourth round of a grand slam.

"After seeing the two first seeds go out, you kind of feel you can
do this too," said the 21-year-old Tomljanovic, who will next meet
Spanish 14th seed Carla Suarez Navarro who ended the run of American
teenager Taylor Townsend with a 6-2 6-2 win.

"I grew up with these girls who are beating them. I went into the
stadium for the first time, and she (Radwanska) kind of feels like
home there, because she's been there a lot more than I have," said
Tomljanovic.

"I went out there and inside I really thought I could win. I think
that showed and it is why I won."

Radwanska's defeat was another boost for 2012 champion and last
year's runner-up Sharapova, who beat Argentine Paula Ormaechea 6-0
6-0 in less than in an hour on court Philippe Chatrier after rain
briefly interrupted the match during the first game when the Russian
had to save three break points.

"The first game was a little bit tough, I felt a bit nervous at the
beginning but I felt really good throughout, especially at the end,"
Sharapova said.

Tomljanovic was joined in the fourth round by former finalist
Samantha Stosur of Australia, who beat Slovakian ninth seed Dominika
Cibulkova 6-4 6-4.

Spain's Garbine Muguruza, who knocked out Serena, backed up her
achievement with a 6-2 6-4 victory over Anna Schmiedlova, the Slovak
who eliminated Williams's sister Venus.